<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>三列布局</title>
	<link rel="stylesheet" type="text/css" href="css/demo3.css">
</head>
<body>
	<div class="warpper">
		<div class="left">
			
		</div>
		<div class="middel">
			
		</div>
		<div class="right">
			
		</div>
	</div>
</body>
</html>